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It is possible that if you replaced the distributor, you simply have the plugs in the wrong firing order. Another possibility is that you need new spark plugs, wires, plugs, distributor rotor and possibly a distributor cap. A long shot problem is the ignition coil, but since you have spark in one plug, it is unlikely.

The spark and fuel system needs to be inspected.---------
The spark plugs are getting fouled or very loose, can cause sputtering problem.Inspect the spark plugs and coil packs.The spark plugs gets power from coil pack.If the spark plugs are very old and dirty, then it needs to be replaced.---------------
The **** problem also relates to faulty worn out spark plugs or clogged fuel filter or low fuel pressure or problem with ignition coil pack.-----------
When coil pack stops giving power to spark plug the car will **** while driving.----------
So very first thing you get tested is spark plugs and ignition coil packs.If they are tested good, but looks very dirty/ worn out, that can also be the reason.----------- But if spark plugs and ignition coil tested ok and cleaned properly, but still same problem, then get fuel pressure tested.If fuel pressure is low, the fuel pump and fuel filter are the cause of problem.-----------
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Also one more thing, " IS there check engine light coming ON dash" ? If yes, then get the car scanned at autozone service center.Its absolutely free to get car scanned at autozone.They do it for no charge.-------
In scanning you will get error codes, as per error codes, it will point towards faulty part, causing this sputtering and jerking problem.-----------------
But if there is no check engine light ion dash, then get the above mentioned possibilities checked.That will help.Thanks.Helpmech.

CHECK FOR SPARK AT SPARK PLUGS.IF NO YOUR DISTRIBUTOR CAP + ROTOR OR COIL COULD BE BAD.MAKE SURE COIL GETTING POWER COULD BE BLOWED IGNITION FUSE.ALSO HAVE TIMING CHECKED IT COULD BE OFF.YOUR DISTRIBUTOR COULD HAVE TURNED A LITTLE THROW OFF TIMING.

Ignition coil or distributor cap. Not knowing the Avenger I couldn't tell you where to find either but follow the HT leads from your plugs and you should find them. If you aren't getting a spark on any plug then the perp is your ignition coil and it'll need replacing, if you're getting a spark on some then it's the dist cap, check the contacts and give them a clean and see what happens. F.Y.I. the dist cap is the first thing back up the line from your plugs with all the HT leads going in, and the ignition coil is after the dist cap.